Purpose. The purpose of this article is to develop the conceptual foundations and substantiation of rational approaches to the formation of an effective system of public administration of the country’s food security. Methodology / approach. The research used the following methods: theoretical generalization (to systematize theoretical provisions regarding the concept of public administration of food security), financial-economic and statistical analysis (to determine and generalize the trends of changes in the main indicators of the level of food security provision), correlation and regression analysis (to determine the influence of factors on the effective indicator of public administration of food security); clustering (to identify countries by the level of food security), abstract-logical and graphic (to generalize and visually present research results). The empirical part of the study was performed on the example of data from 60 countries of the world for the year 2020. Results. The results of the cluster analysis indicate the presence of 3 clusters of countries with a high, medium and low level of food security. Ukraine with a value of 63 points is included in the 2nd cluster. The results of the correlation and regression analysis indicate a significant influence on the effective indicator of the effectiveness of the public administration of food security by such factors as the increase in the average expenditure of the population on food, mainly due to the increase in the cost of the food basket, the decrease in the indicators of income, gross domestic product per capita, food safety programs products and deterioration of land resources. Originality / scientific novelty. For the first time, it was proposed an attributive-relational definition of public administration of food security, a cause-and-effect model was developed for the study of the problem of reducing the global food security index within the interpreted Ishikawa diagram based on the XMind Pro software product, a dynamic regression model was developed for the quantitative assessment of the influence of factors on the state of food security, the use of a bipartite directed graph of the binary transitive relationship “executor-task” of a set of elements of public administration of food security was proposed in order to ensure the possibility of further automation of the processing of large data sets of management processes. Practical value / implications. The main results of the study can be used for the further development of conceptual foundations, improvement of the proposed approaches to the formation of an effective system of public administration of food security and adaptation of management software products to the needs of public administration. The proposed measures of public administration are developed on the basis of researched factors affecting the level of food security, which will make it possible to move from a system of urgent management to a preventive one, focused not only on eliminating the consequences of problems, but also on preventing their occurrence and developing preventive measures for operational response.